added some python script examples

examples/cluster_example.py

@@ -17,7 +17,7 @@ emax=30
 ecutmin=8
 ecutmax=12
 etabins=251
-csize=2
+csize=3
 gain=150
 nbins=100
 indmin=1
@@ -78,6 +78,7 @@ for i in range(indmin,indmax):
 
 fig, ax = plt.subplots()
 ax.plot(ebins[:-1],sp)
+ax.plot(ebins[:-1],spff)
 #ax.set_yscale('log')
 fig.show()
 """